Question

A car is travelling north at a speed 12.9 m/s toward an intersection when the traffic...

A car is travelling north at a speed 12.9 m/s toward an intersection when the traffic light turns red. It takes the car 4.2 seconds to stop.

(a) What is magnitude of the car’s average acceleration?

(b) What is the direction of the car’s average acceleration?

* east

* south

* north

* west

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